Category: Xcode

Xcode is Apple’s integrated development environment for macOS, used to develop software for macOS, iOS, iPadOS, watchOS, and tvOS.

  • Capture first frame of the video as an image on iOS and macOS in swift

    Capture first frame of the video as an image on iOS and macOS in swift

    import Foundation
import Cocoa
import AVKit
import AVFoundation

let asset: AVURLAsset = AVURLAsset.init(url: "URL OF ANY VIDEO local/remote")
let imgGenerator: AVAssetImageGenerator = AVAssetImageGenerator.init(asset: asset)
imgGenerator.appliesPreferredTrackTransform = true
            
imgGenerator.generateCGImagesAsynchronously(forTimes: [NSValue(time: CMTime.zero)]) { (_, image, _, res, error) in
                
                if error == nil {
                    DispatchQueue.main.async {
                           let imageView = NSImage.init(cgImage: image!, size: NSSize.init(width: 180.0, height: 180.0));
                    }
                } else {
                    DispatchQueue.main.async {
                        // Some other fallback image
                    }
                }
}
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  • This app is not allowed to query for scheme fb in iOS

    This app is not allowed to query for scheme fb in iOS

    I wanted to open a Facebook Group page in the Facebook app on my iPhone but I was getting that error since I did not have any LSApplicationQueriesSchemes in my Info.plist file.

    This is the code

    let fbPage = "fb://profile/" + FB_GROUP_ID // Your Facebook group id e.g 8794808798015
let fbURL = URL(string:fbPage)
let canOpenURL = UIApplication.shared.canOpenURL(fbURL!)
if (canOpenURL) {
    UIApplication.shared.open(fbURL!, completionHandler: nil)
}

    After adding ‘fb’ in my scheme it solves the issue.

    My Info.plist file

    This app is not allowed to query for scheme
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  • Manually adding the rootViewController’s view to the view hierarchy is no longer supported. Please allow UIWindow to add the rootViewController’s view to the view hierarchy itself.

    Manually adding the rootViewController’s view to the view hierarchy is no longer supported. Please allow UIWindow to add the rootViewController’s view to the view hierarchy itself.

    I was having this issue when setting a new rootViewController from loginViewController , which was a rootViewController in the storyboard before the transition.

    SSAHomeViewController *homeViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"sIdHomeNavController"];

        [UIView transitionFromView:self.view
                            toView:homeViewController.view
                          duration:0.5
                           options:UIViewAnimationOptionTransitionFlipFromLeft
                        completion:^ (BOOL finished) {
                            if (finished) {
                                [[[UIApplication sharedApplication] windows] firstObject].rootViewController = homeViewController;
                            }
                        }];

    I was not sure what was the problem. Since this works perfect on iOS 13 if I don’t use the [UIView transitionFromView] but I wanted to keep the animation effect, it looked good.

    I decided to made a simple trick, by using a dummy view. Which solved this problem.

    SSAHomeViewController *homeViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"sIdHomeNavController"];

        UIView *dummyView  = [[UIView alloc] initWithFrame:self.view.frame];
        dummyView.backgroundColor = [UIColor whiteColor];
        
        [UIView transitionFromView:self.view
                            toView:dummyView
                          duration:0.5
                           options:UIViewAnimationOptionTransitionFlipFromLeft
                        completion:^ (BOOL finished) {
                            if (finished) {
                                [[[UIApplication sharedApplication] windows] firstObject].rootViewController = homeViewController;
                            }
                        }];

    instead of using homeViewController.view we use dummy view for the animation and white as its background, otherwise you will see black background between transitions.

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